Rock asphalt based demercuration adsorbent and preparation method thereof

A technology of rock asphalt and adsorbent, which is applied in the field of rock asphalt-based mercury removal adsorbent and its preparation, can solve environmental pollution and other problems, and achieve the effects of good adsorption, high-efficiency removal, and complete grain development

Pending Publication Date: 2022-04-12
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flue gas produced by coal combustion contains a large amount of pollutants such as carbon dioxide, inhalable particulate matter, nitrogen oxides, sulfur oxides, and heavy metals. If it is discharged directly without treatment, it will cause serious environmental pollution.

Method used

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Examples

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Effect test

preparation example Construction

[0030] The preparation method of rock asphalt-based mercury-removing sorbent of the present invention comprises the following steps:

[0031] Step 1, the washing of rock asphalt, the operation steps are as follows:

[0032] Step 1.1. Heating the rock asphalt raw material to 300-600°C, then adding water, carrying out hydrothermal reaction treatment, and drying by blasting at 105°C for 10 hours to remove water, to obtain hydrothermal rock asphalt;

[0033] Step 1.2, adding hydrothermal rock asphalt into n-pentane, stirring magnetically for 30-40 minutes, and suctioning with 20-25 μm filter paper, the ratio of n-pentane to rock asphalt powder is (5-8):1;

[0034] Step 1.3, add the residual solid matter after suction filtration in the previous step into n-pentane, stir magnetically for 30-40 minutes, and suction-filter with 8 μm filter paper, the ratio of n-pentane to raw rock asphalt powder is (5-8):1;

[0035] Step 1.4: Add the residue after suction filtration in the previous s...

Embodiment 1

[0049] The KOH solid is ground and passed through a 200-mesh sieve, and the KOH and the washed asphaltene particles are mechanically mixed at a ratio of 0.5:1. The mixture was placed in the center of the tube furnace for carbonization, and 99.9% N 2 , at N 2 Under the atmosphere, the heating rate is 4°C / min, the carbonization temperature is 350°C, and the carbonization time after reaching the carbonization temperature is 0.5h. , to obtain a mercury-removing adsorbent containing rock asphalt base and KOH, K 2 CO 3 with K 2 O mixture. Dissolve the mixture in water, keep the water bath at 90°C for 2 hours, and add 3mol / L HNO dropwise 3 Mix and stir, add dropwise until the solution becomes strongly acidic (pH test paper turns deep red), and stabilize for 1 min. Use a vacuum pump to add UP water to filter the mixed solution, and check the pH value of the filtrate. If the pH value is 7, take out the residue and air-dry it at 80°C for 12 hours to obtain the rock asphalt-based m...

Embodiment 2

[0052] The KOH solid is pulverized through a 200-mesh sieve, and the KOH and the washed asphaltene particles are mechanically mixed at a ratio of 1:1. The mixture was placed in the center of the tube furnace for carbonization, and 99.9% N 2 , at N 2 Under the atmosphere, the heating rate is 8°C / min, the carbonization temperature is 400°C, and the carbonization time after reaching the carbonization temperature is 1h. Contains rock asphalt-based mercury removal adsorbent and KOH, K 2 CO 3 with K 2 O mixture. Dissolve the mixture in water, keep the water bath at 90°C for 2 hours, and add 3mol / L HNO dropwise 3 Mix and stir, add dropwise until the solution becomes strongly acidic (pH test paper turns deep red), and stabilize for 1 min. Use a vacuum pump to add UP water to filter the mixed solution, and check the pH value of the filtrate. If the pH value is 7, take out the residue and air-dry it at 80°C for 12 hours to obtain the rock asphalt-based mercury adsorbent; if the pH...

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Abstract

The invention discloses a rock asphalt-based demercuration adsorbent and a preparation method thereof, and the preparation method comprises the following steps: carrying out hydrothermal reaction treatment on rock asphalt, and drying to obtain hydrothermal rock asphalt; washing and drying the hydrothermal rock asphalt with an organic solvent to obtain asphaltene, and processing the asphaltene into asphaltene particles; alkali is added into asphaltene particles for carbonization and activation, and a mixture containing the rock asphalt-based mercury removal adsorbent is obtained; mixing the mixture with water to form a mixed solution, and adding acid into the mixed solution to enable the mixed solution to be acidic so as to obtain an acidic mixed solution; and carrying out suction filtration on the acidic mixed solution by using water until the filtrate is neutral, filtering out residues, and drying to obtain the rock asphalt-based demercuration adsorbent. According to the invention, the adsorbent is developed to increase the adsorbability of Hg < 0 >, so that the mercury in the flue gas of the coal-fired power plant is efficiently removed, and up-to-standard emission of the mercury in the flue gas is ensured.

Description

technical field [0001] The invention belongs to the field of energy saving and environmental protection, and relates to a rock asphalt-based mercury-removing adsorbent and a preparation method thereof. Background technique [0002] Coal is currently the main energy source. However, coal is an unclean energy source. Research has shown that all elements of the periodic table can be found in coal. The flue gas produced by coal combustion contains a large amount of pollutants such as carbon dioxide, inhalable particulate matter, nitrogen oxides, sulfur oxides, and heavy metals. If it is discharged directly without treatment, it will cause serious environmental pollution. Among them, after the trace amount of heavy metal element mercury in coal-fired flue gas enters the environment, due to its unique enrichment effect, it will cause great harm to the environment and organisms including humans. In recent years, heavy metals in coal-fired flue gas The emission and control of merc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C10C3/00C10C3/02C10C3/08B01D53/02
Inventor 吴晓龙何育东李兴华陶明孟令海何仰朋余昭宦宣州李楠王韶晖房孝维
Owner XIAN THERMAL POWER RES INST CO LTD
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